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Diffstat (limited to 'toolkit/crashreporter/google-breakpad/src/common/memory_range.h')
-rw-r--r-- | toolkit/crashreporter/google-breakpad/src/common/memory_range.h | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/toolkit/crashreporter/google-breakpad/src/common/memory_range.h b/toolkit/crashreporter/google-breakpad/src/common/memory_range.h new file mode 100644 index 000000000..41dd2da62 --- /dev/null +++ b/toolkit/crashreporter/google-breakpad/src/common/memory_range.h @@ -0,0 +1,145 @@ +// Copyright (c) 2011, Google Inc. +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +// memory_range.h: Define the google_breakpad::MemoryRange class, which +// is a lightweight wrapper with a pointer and a length to encapsulate +// a contiguous range of memory. + +#ifndef COMMON_MEMORY_RANGE_H_ +#define COMMON_MEMORY_RANGE_H_ + +#include <stddef.h> + +#include "google_breakpad/common/breakpad_types.h" + +namespace google_breakpad { + +// A lightweight wrapper with a pointer and a length to encapsulate a +// contiguous range of memory. It provides helper methods for checked +// access of a subrange of the memory. Its implemementation does not +// allocate memory or call into libc functions, and is thus safer to use +// in a crashed environment. +class MemoryRange { + public: + MemoryRange() : data_(NULL), length_(0) {} + + MemoryRange(const void* data, size_t length) { + Set(data, length); + } + + // Returns true if this memory range contains no data. + bool IsEmpty() const { + // Set() guarantees that |length_| is zero if |data_| is NULL. + return length_ == 0; + } + + // Resets to an empty range. + void Reset() { + data_ = NULL; + length_ = 0; + } + + // Sets this memory range to point to |data| and its length to |length|. + void Set(const void* data, size_t length) { + data_ = reinterpret_cast<const uint8_t*>(data); + // Always set |length_| to zero if |data_| is NULL. + length_ = data ? length : 0; + } + + // Returns true if this range covers a subrange of |sub_length| bytes + // at |sub_offset| bytes of this memory range, or false otherwise. + bool Covers(size_t sub_offset, size_t sub_length) const { + // The following checks verify that: + // 1. sub_offset is within [ 0 .. length_ - 1 ] + // 2. sub_offset + sub_length is within + // [ sub_offset .. length_ ] + return sub_offset < length_ && + sub_offset + sub_length >= sub_offset && + sub_offset + sub_length <= length_; + } + + // Returns a raw data pointer to a subrange of |sub_length| bytes at + // |sub_offset| bytes of this memory range, or NULL if the subrange + // is out of bounds. + const void* GetData(size_t sub_offset, size_t sub_length) const { + return Covers(sub_offset, sub_length) ? (data_ + sub_offset) : NULL; + } + + // Same as the two-argument version of GetData() but uses sizeof(DataType) + // as the subrange length and returns an |DataType| pointer for convenience. + template <typename DataType> + const DataType* GetData(size_t sub_offset) const { + return reinterpret_cast<const DataType*>( + GetData(sub_offset, sizeof(DataType))); + } + + // Returns a raw pointer to the |element_index|-th element of an array + // of elements of length |element_size| starting at |sub_offset| bytes + // of this memory range, or NULL if the element is out of bounds. + const void* GetArrayElement(size_t element_offset, + size_t element_size, + unsigned element_index) const { + size_t sub_offset = element_offset + element_index * element_size; + return GetData(sub_offset, element_size); + } + + // Same as the three-argument version of GetArrayElement() but deduces + // the element size using sizeof(ElementType) and returns an |ElementType| + // pointer for convenience. + template <typename ElementType> + const ElementType* GetArrayElement(size_t element_offset, + unsigned element_index) const { + return reinterpret_cast<const ElementType*>( + GetArrayElement(element_offset, sizeof(ElementType), element_index)); + } + + // Returns a subrange of |sub_length| bytes at |sub_offset| bytes of + // this memory range, or an empty range if the subrange is out of bounds. + MemoryRange Subrange(size_t sub_offset, size_t sub_length) const { + return Covers(sub_offset, sub_length) ? + MemoryRange(data_ + sub_offset, sub_length) : MemoryRange(); + } + + // Returns a pointer to the beginning of this memory range. + const uint8_t* data() const { return data_; } + + // Returns the length, in bytes, of this memory range. + size_t length() const { return length_; } + + private: + // Pointer to the beginning of this memory range. + const uint8_t* data_; + + // Length, in bytes, of this memory range. + size_t length_; +}; + +} // namespace google_breakpad + +#endif // COMMON_MEMORY_RANGE_H_ |